having done和to have done区别?我们老师说regret to have done,forget having done都表示完成.
人气：213 ℃ 时间：2020-03-25 20:46:53
解答
不同的动词后面加to do或者doing这点是要背的
have done表示完成
跟在不同的动词后面形式不同而已
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